Nvidia Jetson TX2 NX User Manual

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NVIDIA Jetson TX2 NX DG-10141-001_v1.1 | 40
Parameter Requirement Units Notes
<= -40
dB at 6GHz
IL/FEXT plot: See Figure 7-9 TDR plot: See Figure 7-10
Impedance
Trace impedance (Diff pair) 100 Ω
±10%. Target is 100Ω. 95Ω for the
breakout and main route is an
implementation option.
Reference plane GND
Trace spacing/Length/Skew
Trace loss characteristic: < 0.8
< 0.4
dB/in. @ 3GHz
dB/in. @ 1.5GHz
The max length is derived based on
this characteristic. See Note 1.
Trace spacing (pair-pair)
Stripline
Microstrip: pre 1.4b
Microstrip: 1.4b/2.0
3x
4x
5x to 7x
dielectric
For Stripline, this is 3x of the thinner
of above and below.
Trace spacing (Main link to DDC)
Stripline
Microstrip
3x
5x
dielectric
For Stripline, this is 3x of the thinner
of above and below.
Max total length/delay (1.4b/2.0 - up to 5.94Gbps)
Stripline
Microstrip (5x spacing)
Microstrip (7x spacing)
63.5/2.5 (437)
50.8/2.0 (300)
63.5/2.5 (375)
mm/in (ps)
Propagation delay: 175ps/in. for
stripline, 150ps/in. for microstrip).
Max Total Length/Delay (Pre-1.4b)
(up to 165Mhz)
Microstrip
Stripline
254/10 (1500)
225/8.5 (1500)
mm/in (ps)
Propagation delay: 175ps/in. for
stripline, 150ps/in. for microstrip).
Max intra-pair (within pair) skew 0.15 (1) mm (ps) See notes 1, 2, and 3
Max inter-pair (pair to pair) skew 150 ps See notes 1, 2, and 3
Max GND transition via distance 1x Diff pair via pitch
For signals switching reference
layers, add one or two ground
stitching vias. It is recommended they
be symmetrical to signal vias.
Via
Topology Y-pattern is recommended
keep symmetry
Xtalk suppression is the best by Y-
pattern. Also, it can reduce the limit
of pair-pair distance. Need review
(NEXT/FEXT check) if via placement is
not Y-pattern. See Figure 7-11
Minimum impedance dip 97
92
Ω@200ps
Ω@35ps
Recommended via dimension
drill/pad
Antipad
via pitch
200/400
840
880
uM
GND via
Place GND via as symmetrically as possible
to data pair vias. Up to four signal vias (2 diff
pairs) can share a single GND return via
GND via is used to maintain return
path, while its Xtalk suppression is
limited
Max # of vias
PTH via
u-via
4 if all vias are PTH via
Not limited if total channel loss meets IL
spec.
Max via stub length 0.4 mm
long via stub requires review (IL and
resonance dip check)
Topology
The main route via dimensions should comply with the via structure rules (See via section) See Figure 7-8
For the connector pin vias, follow the rules for the connector pin vias (See via section)

Nvidia Jetson TX2 NX Specifications

General

Brand	Nvidia
Model	Jetson TX2 NX
Category	Computer Hardware
Language	English